【摘要】：PET、fMRI、腦磁等高端設備在認知腦功能研究手段中，發(fā)揮著極其重要的作用。相比其他眾多高端設備而言腦電圖設備具有使用和維護成本較低、時間分辨率較高等特點，在常用的研究、診斷技術中受到了科研工作者和臨床醫(yī)生的廣泛關注。本文設計了一種高性能，寬頻段具有阻抗檢測功能的八導腦電放大器。該腦電放大器前端采用高性能儀用運放AD8221，和16位D/A組成直流校正差分放大器。直流抵消后的腦電信號通過陷波器和有源低通濾波器接至電子開關。DSP控制電子開關和A/D轉換循環(huán)采集八路腦電信號，同時DSP控制D/A進行直流校正。采樣后的腦電信號通過USB2.0實時上傳至上位機。上位機將采集到的腦電信號以文本形式存儲至PC機。 為了驗證腦電放大器的性能，我們記錄了睜眼和閉眼的自發(fā)腦電。最后還將此腦電放大器接入我們實驗室開發(fā)的SSVEP系統(tǒng)中，被試在進行視覺刺激時，我們設計的八導腦電放大器能夠明顯記錄到穩(wěn)態(tài)視覺誘發(fā)電位。因此，本文設計的八導腦電放大器可以應用于認知腦功能研究中，，還可為臨床醫(yī)生和BCI領域提供良好的研究平臺。
[Abstract]:High-end equipment, such as PET,fMRI, plays an extremely important role in cognitive brain function research. Compared with many other high-end equipment, EEG equipment has the characteristics of low cost of use and maintenance, high time resolution and so on. It has been widely concerned by researchers and clinicians in the common research and diagnosis technology. In this paper, a high performance, wide band impedance detection EEE amplifier is designed. The front end of the EEG amplifier consists of a high performance operational amplifier AD8221, and a 16 bit D / A DC corrected differential amplifier. The EEG signal after DC cancellation is connected to the electronic switch by notch filter. DSP controls the electronic switch and the A / D converter circulates to collect eight EEG signals, while DSP controls D / A for DC correction. The sampled EEG signals are uploaded to the host computer by USB2.0 in real time. The upper computer stores the collected EEG signals in the form of text to the PC machine. To verify the performance of EEG amplifiers, we recorded spontaneous EEG of open and closed eyes. Finally, the EEG amplifier is connected to the SSVEP system developed by our laboratory. When the subjects are given visual stimulation, the eight conductance EEG amplifier we designed can record the steady-state visual evoked potential (VEP) obviously. Therefore, the eight-conductance EEG amplifier designed in this paper can be applied to cognitive brain function research and provide a good research platform for clinicians and BCI.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2012
【分類號】：R318

【參考文獻】

相關期刊論文 前1條

1 王繼軍,張明島;腦電Gamma共振信號在精神疾病中的研究應用[J];上海精神醫(yī)學;2005年04期

本文編號：2252599